Flirting in the After Life

I do not believe Fred Weasley is a ghost, J.K Rowling said herself that he would of passed on. (I also really like the theory he is hanging with the Marauders in the afterlife) Though her saying that made me start thinking of what if he was. I think that he would be best friends with Peeves and flirt with The Grey Lady, and Myrtle would be really jealous because she saw him first. Though it would also kind of suck because I assume being a ghost sucks.

Though sometimes I wonder if Hogwarts had any new ghosts after the Battle of Hogwarts

Drawings of Fred:
fav.me/d8zsgjy
fav.me/d8ae8gs
fav.me/d6j2h1m
fav.me/d914glu